.\" -*- nroff -*-
.\" Copyright 2013 Los Alamos National Security, LLC. All rights reserved.
.\" Copyright 2009-2010 Cisco Systems, Inc.  All rights reserved.
.\" Copyright 2007, Sun Microsystems, Inc.
.\" Copyright (c) 1996 Thinking Machines Corporation
.\" Copyright (c) 2020      Google, LLC. All rights reserved.
.\" Copyright (c) 2020      FUJITSU LIMITED.  All rights reserved.
.\" $COPYRIGHT$
.TH MPI_Comm_accept 3 "#OMPI_DATE#" "#PACKAGE_VERSION#" "#PACKAGE_NAME#"
.SH NAME
\fBMPI_Comm_accept \fP \- Establishes communication with a client.

.SH SYNTAX
.ft R
.SH C Syntax
.nf
#include <mpi.h>
int MPI_Comm_accept(const char *\fIport_name\fP, MPI_Info \fIinfo\fP, int \fIroot\fP, MPI_Comm \fIcomm\fP, MPI_Comm *\fInewcomm\fP)

.fi
.SH Fortran Syntax
.nf
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_COMM_ACCEPT(\fIPORT_NAME, INFO, ROOT, COMM, NEWCOMM, IERROR\fP)
	CHARACTER*(*)	\fIPORT_NAME\fP
	INTEGER		\fIINFO, ROOT, COMM, NEWCOMM, IERROR\fP

.fi
.SH Fortran 2008 Syntax
.nf
USE mpi_f08
MPI_Comm_accept(\fIport_name\fP, \fIinfo\fP, \fIroot\fP, \fIcomm\fP, \fInewcomm\fP, \fIierror\fP)
	CHARACTER(LEN=*), INTENT(IN) :: \fIport_name\fP
	TYPE(MPI_Info), INTENT(IN) :: \fIinfo\fP
	INTEGER, INTENT(IN) :: \fIroot\fP
	TYPE(MPI_Comm), INTENT(IN) :: \fIcomm\fP
	TYPE(MPI_Comm), INTENT(OUT) :: \fInewcomm\fP
	INTEGER, OPTIONAL, INTENT(OUT) :: \fIierror\fP

.fi
.SH INPUT PARAMETERS
.ft R
.TP 1i
port_name
Port name (string, used only on \fIroot\fP).
.TP 1i
info
Options given by root for the accept (handle, used only on root). No options currently supported.
.TP 1i
root
Rank in \fIcomm\fP of root node (integer).
.TP 1i
comm
Intracommunicator over which call is collective (handle).

.SH OUTPUT PARAMETERS
.ft R
.TP 1i
newcomm
Intercommunicator with client as remote group (handle)
.TP 1i
IERROR
Fortran only: Error status (integer).

.SH DESCRIPTION
.ft R
MPI_Comm_accept establishes communication with a client. It is collective over the calling communicator. It returns an intercommunicator that allows communication with the client, after the client has connected with the MPI_Comm_accept function using the MPI_Comm_connect function.
.sp
The \fIport_name\fP must have been established through a call to MPI_Open_port on the root.


.SH ERRORS
Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument.
.sp
Before the error value is returned, the current MPI error handler is
called. By default, this error handler aborts the MPI job, except for I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned.
.sp
See the MPI man page for a full list of MPI error codes.

.SH SEE ALSO
MPI_Comm_connect
MPI_Open_port
.br

